Orneau

Orneau
The Orneau flowing through Mazy
Other name(s)	Ôrnô
Basin features
Main source	près de Meux
River mouth	Jemeppe-sur-Sambre 50°26′58″N 4°40′45″E / 50.44942°N 4.67905°E / 50.44942; 4.67905Coordinates: 50°26′58″N 4°40′45″E / 50.44942°N 4.67905°E / 50.44942; 4.67905
Progression	Sambre
River system	Meuse

The Orneau (Walloon: Ôrnô) is a river in Belgium. It is a tributary of the Sambre and therefore sub-tributary of the Meuse.

The Orneau flows from north to south, through the province of Namur, and after a journey of about 25 kilometres (16 mi), it flows into the Sambre at Jemeppe-sur-Sambre.